X-radiation is only emitted by the hottest and most energetic parts of the Universe - sites of gigantic explosions, plasma heated to millions of degrees, and where there are intense magnetic or gravitational fields.
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Watch video X-ray Astrophysics: The High Energy Cosmos - Professor Carolin Crawford online without registration, duration hours minute second in high quality. This video was added by user Gresham College 05 December 2012, don't forget to share it with your friends and acquaintances, it has been viewed on our site 73,101 once and liked it 527 people.